MOSCOW, Aug. 30 - In addition to its own arbitration claims relating to the terms of the contract to supply gas to Ukraine, Russia's Gazprom has for the first time disclosed the amount of counter-claims by NJSC Naftogaz Ukrayiny, which it said were $14.23 billion.

Gazprom filed a claim against Naftogaz for unpaid gas with the Arbitration Institute of the Stockholm Chamber of Commerce on June 16, 2014. The overall claim increased to $31.75 billion when take-or-pay demands were added.